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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 903 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 89 =
  2. 2.Double 25 =
  3. 3.Double 55 =
  4. 4.Half of 130 =
  5. 5.Double 29 =
  6. 6.Half of 86 =
  7. 7.Half of 166 =
  8. 8.Double 28 =
  9. 9.Double 72 =
  10. 10.Double 26 =
  11. 11.Double 44 =
  12. 12.Half of 102 =
  13. 13.Half of 146 =
  14. 14.Half of 174 =
  15. 15.Half of 114 =
  16. 16.Double 22 =
  17. 17.Double 57 =
  18. 18.Double 53 =
  19. 19.Double 17 =
  20. 20.Half of 116 =
  21. 21.Double 19 =
  22. 22.Half of 172 =
  23. 23.Double 83 =
  24. 24.Half of 36 =
  25. 25.Half of 142 =
  26. 26.Double 48 =
  27. 27.Half of 40 =
  28. 28.Half of 94 =
  29. 29.Half of 112 =
  30. 30.Double 16 =
  31. 31.Half of 144 =
  32. 32.Half of 190 =
  33. 33.Half of 126 =
  34. 34.Half of 64 =
  35. 35.Half of 98 =
  36. 36.Double 52 =
  37. 37.Half of 68 =
  38. 38.Double 91 =
  39. 39.Double 42 =
  40. 40.Half of 72 =

Answer key

  1. 178
  2. 50
  3. 110
  4. 65
  5. 58
  6. 43
  7. 83
  8. 56
  9. 144
  10. 52
  11. 88
  12. 51
  13. 73
  14. 87
  15. 57
  16. 44
  17. 114
  18. 106
  19. 34
  20. 58
  21. 38
  22. 86
  23. 166
  24. 18
  25. 71
  26. 96
  27. 20
  28. 47
  29. 56
  30. 32
  31. 72
  32. 95
  33. 63
  34. 32
  35. 49
  36. 104
  37. 34
  38. 182
  39. 84
  40. 36

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